Preexhaust-port attachment.



B. W. KING. PREEXHAUST PORT ATTACHMENT, APPLIUATION FILED MAY 21. 1909.

1 -,'OO8,.O3 Patented Nov. 7, 1911.

BY 46 [It 7/ Q. ,7 ATTORNEY T 0 all whom it may concern:

Be it"known that I, BERTELL lV. :KING, a citizen of the United States, and a resident of the/city of New York,"in the county of New York and State of New York, United States of'America, have invented certain new and useful IIl'lPlOVQlTlGIltS in Preexhaust-Port Attachments, of which the following is a specification.

My invention relates to a pro-exhaust port attachment for use in conjunction with internal combustion engines, and its object is to provide a simple device which may be used to protect the engine and to reduce the sound of its exhaust.

I Jwill describe-my invention in the fol' lowingspecification and point out the novel featuressthereof 1n the appended claims.

Referring to the drawings, Figure 1 1s a side elevation, partly in section, of an internal combustion engine of well-known design and construction, with myinvention 'shown lnconjunction with. its pre-exhaust ports. Fig. 2 sectional plan view of some of, the parts shown in Flg. 1, the tion in this figure being taken'on the line 2-2 of the latterfigure. Fig. 3 is a sectional side elevation, on an enlarged scale,

of a preferred form of mufller which I use in conjunction with my invention.

Like characters of reference designate corresponding parts in all of the figures.

1O designates an internal combustion en- I gine which may be of any desired form or construction. I have shown it as a fourcycle air-cooled motor of a type commonly usedon motor cycles. The parts of such an engine are well-known, so Twill point out only such of them as will be necessary to describe my invention.

11 is the cylinder of the engine. The usual intake and exhaust ports with their controlling valves 'are situated near the upper end of this cylinder and are soshown in Fig. 1. Near the lower end of the cylin der are a plurality of pro-exhaust ports 12 which are arranged to be uncovered by the piston 13 when the latter reaches the lower limit of its travel. These pro-exhaust ports are in common use and are for the purpose of relieving the pressure in the cylinder after the piston has been driven down, and for leading off a portion 'of the exhaust gases before the piston starts on its upward stroke. As these pre-exhaust ports are Specification of Letters Patent.

Application filed May 21, lees.

- sets corresponds in number BEn'rELt w. KING, or NEW Yemen? Y PREEXHAUST PORT. ATTACHMENT.

Patented Serial No. 497,45

opencd rapidly while the gases within the cylinder are under pressure,

able noise. lVhen the piston reaches the lower limit of its movement on the suction stroke some air also through these ports. reaches the upper limit of its .movement these pie-exhaust ports are uncovered by the lower edge of the there is a liability into the lower part is to materially overcome both prevent extraneous matter through th in into the engine,

Outside of that from passing ports 12.

Fig. 2, is gether by bolts as at 15. two sets of ports 16 andl't'.

and in circumferential. position with the number and the position of the pre-exhaust ports.

Over each of the ports 17 is attached a muffler 20, which is a metallic member of peculiar design. Each of these members is provided with a threaded stem 21 which is arranged to be screwed directly into the ports 17 which, of course, are first tapped to fit thestem. The stem 21 is carried out in the form of a hollow cylinder 22 in which are a plurality of perforations 23. Integral with these parts is a dome-like hood 24 in which are perforations 25. These perforations are preferably back nearer the engine than are those in the cylinder 22, so that the structure forms tortuous passages for the exhaust gases. The perforations in the hood 24: are preferably of very small size but of sufficient number to together form ample area for the outward flow of exhaust gases and the inward flow of air. Because of their small size the perforations in this hood form a screen which protects the cylinder from dirt and dust getting into it through the pre-exhaust ports.

piston,'and as a cer-. tain amount of air will then pass from the outside of the engine through these ports,

of dust and dirt getting r of the cylinder through 1 them. One of the purposes of my invention of these ditficultics by a simple attachment which will, reduce the explosive sound of the exhaust. and will effectively screen the ports :and.

Nov. '7, 1911.

the passage'of the gases through them produces a disagreepasses. into the cylinder- Again, as the pistonportion of the engine.

which forms the cylinder a groove is pro-., vided in alinementflwith the preexhaust 'Rotatably mounted in the groove is a collar 14 which; as may be seen fron. made up of twoparts clamped to- 1 In this collar. are

Eachof these.

At the same time these .110

attachments act as mufflers for that part of ternal combustion engine having a cylinder the exhaust, which passes out through the ortis to which the devices are applied.

The collar 14, when in a position in which it is shown in Fig. 2, is arranged to elose all of the pre-exhaust ports. clamps and rotating it a certain amount the By loosening its g provided with a preexhaust port, of an attarhment for said port comprising a member movably mounted over said port, said ineniher-being eol'istrueted to form openings, and

a device connected with the member at one 1 of the openil'lgs in said member arranged to ports 16 may he brought into alinement with j the pro-exhaust; ports 12, in which case the latter are in direet communicationwith the outer air and the engine will act in exaetly the same manner as it would without my invention applied to it. By rotating it in the opposite (lll'Ct'tlOll the ports 1'7 may he brought into alinement, with the pre-exhaust ports 12, in \\lli(,'ll case the exhaust gases will he mntlhzd and the lntlowinn' air sereemal.

it is evident that these changes in the position ot the rolla r 14 may be easily mad and that the eollar may he seeurely clamped in any one (it its desired bositions.

form an expansion chamber and tortuous passages for the exhaust gases, said member being arranged in its different positions to elose the pie-exhaustport, to connect said pre-exhaust port with said device or to have one of the openings in said memher exclusiw ol that opening to which said device is ('tlllll( 't(.tl in alinement with said port.

3. The combination with a tour-cycle in ternal combustion engine having a cylinder provided with a plurality ot pie-exhaust ports in rirmunt'erential alinement with each i other, of a c llar rotatahly supported by the While my invention is shown as applied i to a motor eyr-le engine in Fig. 1. it is evident that it may he applied to engines ol' ditl'erent typehaving pro-exhaust portaand in some ('HMS it may he used to advantage with the main exhaust ports of internal ronr hnntion engines.

hat I elaim ia--- l. 'lhe romhination with an internal oomhustion engine tuning a cylinder provided with an exhaust port, of an attachment tor said port eomprising a member morality mounted over said port, said member being constructed to form an opening, and a device connected with the member at said opening arranged to form an. expansion ehamhe' and tortuous passages for the er:- haust gases, said member being arranged to close the exhaust port or to connect such port with said device.

2. The combination with a f0ur-cyele ineylinder and over said ports, said collar heing PIOfltlCtl \\'lt h one set ot openings correspondim in nnnihei' and in relative positions with said ports. a device over each of said openings for mullling the exhaust gases and preventing dirt from heingl' drawn hark into the engine; said eollar being also prmided with a serond set oi. i'ipeningrs supplying tree pa sages through the collar, said second set of openings also ttil'ltfflflllldillfll inmunher and in relative positions with said exhaust ports; said t-ollar heing so arranged that it may he nun-ed so that none of the openings or either set ot openings therein will be in register with aaid pro-exhaust ports. in testimony whereof I have signed my name to this specification in the presence of two suhsorihing witnesses.

BERTELL W. KING. \Vitn esses hm es'r \V. MARSHALL, ELLA 'lUcII. 

